Re: {Chrysler 300} Lead additive

[Steve <saforwardlook@xxxxxxxxx>]

Is Marvel Mystery Oil comparable in terms of reasons  for use as
Seafoam - i.e. keep the engine free of oil sludge and to also keep the
fuel system clean?

Steve Albu

On Wed, Jan 7, 2026 at 11:23 AM John Nowosacki <jsnowosacki@xxxxxxxxx> wrote:
>
> My dad always added some Marvel to his crankcase oil with each change, and also mixed some into a full tank of gas about 4 times a year.  I have not done that on my G.  I did have to do a valve job last year due to one burned exhaust valve (#4) at only 80K miles.  Maybe I had a lean condition in that cylinder due to a slight vacuum leak over many years?  I don't know.  I do remember all the family use cars from our 56 Plymouth, 63 Plymouth Fury 318, and 70 Sport Fury LA 318, and how the other men in the neighborhood 'Marveled' at how my dad could get over 100K miles on his cars in an era where that was not to be expected.
>
> On Wed, Jan 7, 2026 at 12:21 PM Anthony Doughty <62red300h@xxxxxxxxx> wrote:
>>
>> I've used Marvel Mystery Oil for almost 40 years on cars we've driven and toured regularly ranging from the Brass Era to our 300H.  Never had any valve problems.  I don't know exactly what it does or how it does it, but perhaps that's the "Mystery".  Anyway, it seems to do it well, and you just gotta love that name!
>> ________________________________
>> From: 'Peter Pellicani' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
>> Sent: Wednesday, January 7, 2026 5:24 PM
>> To: Tom Wilburn <tomwilburn1@xxxxxxxxx>
>> Cc: Noel Hastalis <cpaviper@xxxxxxxxxxx>; dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx <dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx>; Richard McFarland <firemc1958@xxxxxxxxx>; Club International Chrysler <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
>> Subject: Re: {Chrysler 300} Lead additive
>>
>> I use Marvel mystery oil 4 oz/10 gals never had a problem 200,000 miles on original engine never had engine dismantled 1961
>> Peter
>> Sent from my iPhone
>>
>> On Jan 6, 2026, at 10:24 PM, Tom Wilburn <tomwilburn1@xxxxxxxxx> wrote:
>>
>> Noel
>>
>> This fall I showed my F at the Audrain concours in Rhode Island.
>>
>> Jay Leno came over and told me the same thing - he uses Marvel Mystery oil in his G.
>>
>> Sent from my iPhone
>>
>> On Jan 6, 2026, at 9:57 PM, 'Noel Hastalis' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
>>
>> Danny,
>>
>> My F motor - original block - has been rebuilt with hardened valve seats so I don’t use a lead additive. I do add a few ounces of Marvel Mystery Oil with every fill-up. Run the highest octane available 91/93. Ethanol free gas here in the Chicago area is only a pipe dream, so only running the corn gas. I do have an electric fuel pump, that Joe Jordan installed, mounted just fore of the gas tank and that helps a lot when the car has been sitting more than three days. Otherwise, as has been said here, it takes extended cranking to fire it up. Since I bought the F 20 years ago it’s had no butterflies in the heat risers so that’s a non-issue - whether I’ve fired up the motor in 10 degree or 90 degree temps to take it out for some exercise. Certainly takes a little longer to warm it up when the temps are sub freezing.
>>
>> Noel
>>
>> p.s. I started adding the Marvel Mystery Oil over 10 years ago after meeting a fellow displaying an immaculate black 300-G coupe at Iola, who highly recommend recommended it. I’ve never seen his G since. His business was building diesel engines of all sizes and said he adds Marvel to every motor.
>>
>> Sent from my iPhone
>>
>> On Jan 6, 2026, at 6:42 PM, dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>>
>> 
>>
>> You may drive it around the world and back with no lead and no problem. Does Noel use lead in his F?
>>
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>>
>>
>> Daniel D. Plotkin
>>
>> Daniel Plotkin & Associates LLC
>>
>> 54 Capri Drive
>>
>> East Longmeadow, Massachusetts 01028
>>
>> 413 237 9629
>>
>> dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx
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>> -----Original Message-----
>> From: "'Richard McFarland' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
>> Sent: Tuesday, January 6, 2026 7:20pm
>> To: "Club International Chrysler" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
>> Subject: {Chrysler 300} Lead additive
>>
>> Don’t want to start a big back and forth but I have one of “ those” questions. I have a 63 non letter 383. I have been running a lead additive as I’m not sure if Chrysler was using hardened valve seats in 63. I have heard yes and no. It’s kind of a pain and getting expensive as I do drive the car quite a bit. Some of you gurus: do I need to run the lead additive? It has 93,000 original miles and never been out of the car.
>> Thanks
>> Sent from my iPad
>>
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